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On Jun 23, 2023, at 9:08 PM, Keith S. Angus <keithsangus@...> wrote:
?On Fri, Jun 23, 2023 at 08:31 PM, Charles Kinzer wrote:
Brilliant idea to turn your lathe into a generator! ?Just apply electricity to the commutator and then harvest power from the plug. ?Handy if you don¡¯t have, errm, electricity.
Back in the days when electrical interference was more of a problem than it is now, in that very little equipment was protected from it, it was found that one of the best ways to avoid mains borne interference was to make up a motor generator set, mains driven, with the generator giving whatever voltage you needed. Not the same as a rotary convertor, as that does not give electrical isolation. Also adding a big flywheel would smooth out any momentary glitches in the supply.
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On Fri, Jun 23, 2023 at 08:31 PM, Charles Kinzer wrote:
Brilliant idea to turn your lathe into a generator! ?Just apply electricity to the commutator and then harvest power from the plug. ?Handy if you don¡¯t have, errm, electricity.
Back in the days when electrical interference was more of a problem than it is now, in that very little equipment was protected from it, it was found that one of the best ways to avoid mains borne interference was to make up a motor generator set, mains driven, with the generator giving whatever voltage you needed. Not the same as a rotary convertor, as that does not give electrical isolation. Also adding a big flywheel would smooth out any momentary glitches in the supply.
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You sometimes see a rotating chuck for use in the tailstock - they were intended to support the end of a dynamo (or motor) when skimming the commutator. I dimly recall diamond tipped tools being used for this. Wish I'd grabbed a few back when I worked with contact lenses, turned up with diamond tools on spherical turning lathes.
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Hmm¡? could this be a perpetual motion machine?
?
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From: [email protected] < [email protected]> On Behalf Of
Mehmood via groups.io
Sent: Friday, June 23, 2023 12:20 PM
To: [email protected]
Subject: [Unimat] ISO Steady rest
?
Brilliant idea to turn your lathe into a generator! ?Just apply electricity to the commutator and then harvest power from the plug. ?Handy if you don¡¯t have, errm, electricity.
?
Here's one I bought some years ago on eBay. I cannot find a better picture of it.
Peter Brixey in sunny Florida.
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++ Santa's helpers are subordinate clauses.
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On Jun 23, 2023, at 3:20 PM, Mehmood via groups.io <mehmood.naqshbandi@...> wrote: ? Brilliant idea to turn your lathe into a generator! ?Just apply electricity to the commutator and then harvest power from the plug. ?Handy if you don¡¯t have, errm, electricity.
Begin forwarded message:
?
Here's one I bought some years ago on eBay. I cannot find a
better picture of it.
Peter Brixey in sunny Florida.
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There was (is?) a type of lathe called a "commutator lathe".? Their most typical application was most likely turning the commutators (cleaning them up) on automobile generators.? It was a pretty common item in auto repair garages at one time.? It is sized to swing the large diameter of the armature but with strength more in line with turning the smaller diameter of the commutator.? So, even more so than regular lathes, it was not designed at all to machine anything the size of its full swing.
Charles E. "Chuck" Kinzer
On Friday, June 23, 2023 at 12:20:24 PM PDT, Mehmood via groups.io <mehmood.naqshbandi@...> wrote:
Brilliant idea to turn your lathe into a generator! ?Just apply electricity to the commutator and then harvest power from the plug. ?Handy if you don¡¯t have, errm, electricity.
Begin forwarded message:
?
Here's one I bought some years ago on eBay. I cannot find a
better picture of it.
Peter Brixey in sunny Florida.
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Brilliant idea to turn your lathe into a generator! ?Just apply electricity to the commutator and then harvest power from the plug. ?Handy if you don¡¯t have, errm, electricity.
Begin forwarded message:
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?
Here's one I bought some years ago on eBay. I cannot find a
better picture of it.
Peter Brixey in sunny Florida.
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Here's one I bought some years ago on eBay. I cannot find a
better picture of it.
Peter Brixey in sunny Florida.
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Re: Unimat SL1000 adjustments.
You may be able to put some brass shim under the headstock if it is low relative to tailstock centre.?
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On 23 Jun 2023, at 12:23 am, Quinn Golden <quinngolden@...> wrote:
?I am presuming the drill was mounted in the tail stock. If you can duplicate the set up, and the drill wanders downhill, repeat the set up and rotate the drill 90¡ã and see if it wanders in that direction. ? ?I suspect the drill bit is your challenge and not the machine. ?
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Re: Unimat SL1000 adjustments.
Take the way bars off and check them for straightness? ?Maybe try them the other way up? ?Or even turn one around?
I¡¯m not an expert on this, just thinking of easy things to check.
My first thought was maybe the base is bent, and maybe then clamp it down with something thin underneath in the middle, and measure the straightness somehow as you slowly tighten the clamps to straighten the base, but I¡¯m way out of my depth here.
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On 22 Jun 2023, at 15:17, Quinn Golden <quinngolden@...> wrote:
?I am presuming the drill was mounted in the tail stock. If you can duplicate the set up, and the drill wanders downhill, repeat the set up and rotate the drill 90¡ã and see if it wanders in that direction. ? ?I suspect the drill bit is your challenge and not the machine. ?
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Re: Unimat SL1000 adjustments.
Another good point but I can't get over the description of the
hole angling down. If the workpiece is in the headstock chuck
there is no such thing as down. I can see getting a tapered hole
but not an angled down hole. If the piece isn't straight you might
come out off center but that wouldn't be a fault in the lathe.
On 6/22/23 10:35, Jay Perez wrote:
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Good point Quinn,
I've seen a number of new drill bits from Harbor
Freight where the lips are not of equal length. This will
cause a bit to wander.
One visual clue of this condition is different
amounts of chips coming out of the flutes as you're drilling.
Jay
I am
presuming the drill was mounted in the tail stock. If you can
duplicate the set up, and the drill wanders downhill, repeat
the set up and rotate the drill 90¡ã and see if it wanders in
that direction. ? ?I suspect the drill bit is your challenge
and not the machine. ?
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Re: Unimat SL1000 adjustments.
I was thinking the same thing, bum drill-bit.? With a headstock/tailstock miss-alignment he would have always been turning tapers.
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Re: Unimat SL1000 adjustments.
Good point Quinn,
I've seen a number of new drill bits from Harbor Freight where the lips are not of equal length. This will cause a bit to wander.
One visual clue of this condition is different amounts of chips coming out of the flutes as you're drilling.
Jay
I am presuming the drill was mounted in the tail stock. If you can duplicate the set up, and the drill wanders downhill, repeat the set up and rotate the drill 90¡ã and see if it wanders in that direction. ? ?I suspect the drill bit is your challenge and not the machine. ?
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Re: Unimat SL1000 adjustments.
I am presuming the drill was mounted in the tail stock. If you can duplicate the set up, and the drill wanders downhill, repeat the set up and rotate the drill 90¡ã and see if it wanders in that direction. ? ?I suspect the drill bit is your challenge and not the machine. ?
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Re: Unimat SL1000 adjustments.
Part of the secret of Gun drills is the cooling. Not only does it cool the tool tip, but it aids in the removal of the chips. It is the buildup of chips that contributes to a twist drill wandering. ?
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Re: Threadcutting on a Unimat 3
I have seen references to people adapting the Sherline thread cutting attachment to Taig lathes. Not sure how practical it would be to try and make it work on a Unimat.
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Re: Unimat SL1000 adjustments.
A downward slant suggests a vertical misalignment. That is difficult to
adjust on the Unimat as they are not designed for vertical adjustment.
Also, there are several places that may be causing the misalignment, if
that is the problem.
Elliot
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On 6/21/23 5:39 PM, Richy Russo via groups.io wrote: Thanks!
? My problem is I was drilling thru a brass rod to make it a fuel tube
for an SU carburetor. It was approx 2 inches long. I started with a
small pilot, but as I moved up in size I noticed it was drilling into
the workpiece on a downward slant. I was able to complete the process
and make it work. But I asked here because I would like to correct it. I
did manage to get it a little closer messing with the headstock.
? Regards Richy
--
Elliot Nesterman
elliot@...
www.ajoure.net
"The finest jewel cannot disguise a flawed character."
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Re: Unimat SL1000 adjustments.
Hello Dick:
?
As a tool maker I bought two Brown & Sharpe Best Test indicators, the first is 0.0005" and cost me $35 in 1973. The 0.00005 cost me $100 in 1977. They both still work great.
?
Carl.
On 06/21/2023 9:26 PM EDT OldToolmaker via groups.io <old_toolmaker@...> wrote:
?
?
Hello Carl,
Where did you get the 50 millionths indicator? That is quite a close resolution to be using on a Unimat!
Dick
--
http://www.homemadetools.net/
forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
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Re: Unimat SL1000 adjustments.
Hello, Keith,
Yes, gun drills can produce a very deep and accurate hole. They have coolant holes in the ends and are usually used with coolant or oil under high pressure. We drilled deep waterline holes in the plates In injection mold plates. The finish left in the resultant holes was very clean and smooth. Of course it required special equipment and guide bushings to produce nice holes and flush swarf out.
Dick
-- http://www.homemadetools.net/ forum/ ?OFF-SET-tailstock-center-65965#post105972?SMALL TURRET TOOL POST PLANS??LARGE TURRET TOOL POST PLANS?MINI-LATHE CARRIAGE LOCK PLANS?SMALL QC TOOL POST PLANS??QUICK CHANGE LATHE TURRET?MINI LATHE COMPOUND PIVOT MODIFICATION
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Re: Unimat SL1000 adjustments.
Hello Carl,
Where did you get the 50 millionths indicator? That is quite a close resolution to be using on a Unimat!
Dick
--
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
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Steve Johnson
John Entwistle
Carl
OldToolmaker